1973AllenLAUM 1.207 (as of c1950), Mouth harp . . dominates the Midland speech area [in the Upper Midwest] except for the extreme southeastern sector, where South Midland speech is typical and where the accepted form is French harp.

1971WoodVocab. Change 40 Sth, A harp with a kind of tine which is plucked while one blows against it, is known first as a jew’s harp and second as a juice harp. . . French harp is not reported in Florida [but occurs occasionally in the other seven Sthn states investigated].